Preparing method of low-silicon pre-melted slag for electroslag remelting

A technology of electroslag remelting and pre-melting slag, which is applied in the field of preparation of low-silicon pre-melting slag for electroslag remelting, can solve the problems of unfavorable large-scale promotion, high cost, and increased production cost, and achieves a significant desiliconization effect , low equipment requirements, easy to control the effect

Active Publication Date: 2015-11-11
NORTHEASTERN UNIV
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Problems solved by technology

[0003] Fluorite and lime are necessary raw materials for the production of pre-slag, but due to SiO in raw materials such as fluorite and lime 2 Higher content, easy to lead to higher SiO content in the pre-slag 2 , so that when it is used to produce alloys containing Ti, Al and other easily oxidizable elements, it is very easy to cause a large amount of burning loss of Ti, Al and other elements, which seriously affects the metallurgical quality of this type of alloy, and the yield is extremely low, and the production cost is greatly increased. , so it is urgent to develop a method to effectively reduce SiO in pre-slag 2 content method
The Chinese patent with the publication number CN102277501A discloses a process for electroslag remelting of titanium-containing alloy steel. The process adds Al powder, Fe-Ti powder and CaF 2 The electroslag remelting process of powder mixture to prepare titanium-containing alloy steel can effectively solve the problem of a large amount of burning loss of Ti element in steel, but in this process, the process parameters such as electroslag remelting smelting process parameters and the amount of mixture added are controlled. Difficult, not practical
In addition, the process of using iron-aluminum rod electroslag remelting to purify the pre-slag can achieve the reduction of SiO in the pre-slag 2 content, but the single purification slag amount of this technology is small, the efficiency is low, and the cost is extremely high, which is not conducive to large-scale promotion

Method used

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  • Preparing method of low-silicon pre-melted slag for electroslag remelting

Examples

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Effect test

Embodiment 1

[0038] Lime, fluorite and fused magnesia are crushed to 0mm-10mm, uniformly mixed with alumina powder to prepare slag, and dried, wherein the slag includes: CaO: 26 %, CaF 2 : 37%, Al 2 o 3 : 34.5%, MgO: 1.0%, SiO 2 : 0.95%, FeO: 0.15%, and the rest are impurities. Weigh 600kg of slag material and add it to a 1600kg three-phase slag melting furnace; turn on the power, start arcing at a voltage of 35kV, and after the current reaches a stable value (1.5kA), adjust the voltage and current to 49kV and 2.3kA respectively, and use 30kg Add 800kg of slag to it at a speed of 1 / min, and the smelting time is 85min; all the slag is melted, and the temperature of the molten slag is controlled to be 1590°C. The iron-aluminum alloy rod with an aluminum content of 15% by mass percentage is turned with a lathe to obtain iron-aluminum alloy chips with a size ≤ 50 mm, and 47.04 kg of iron-aluminum alloy chips are added to the molten slag to make it evenly distributed on the surface of the s...

Embodiment 2

[0040] Lime, fluorite and fused magnesia are crushed to 0mm-10mm, uniformly mixed with alumina powder to prepare slag, and dried, wherein the slag includes: CaO: 26 %, CaF 2 : 37%, Al 2 o 3 : 34.5%, MgO: 1.0%, SiO 2 : 0.95%, FeO: 0.15%, and the rest are impurities. Weigh 550kg of slag material and add it to a 1600kg three-phase slag melting furnace; turn on the power, start arcing at a voltage of 35kV, and after the current reaches a stable value (1.4kA), adjust the voltage and current to 49kV and 2.3kA respectively, and use 30kg Add 850kg of slag to it at a speed of 1 / min, the smelting time is 85min, all the slag is melted, and the temperature of the molten slag is controlled to be 1600°C. The iron-aluminum alloy rod with an aluminum content of 15% by mass percentage is turned with a lathe to obtain iron-aluminum alloy chips with a size ≤ 50 mm, and 49.28 kg of iron-aluminum alloy chips are added to the molten slag to make it evenly distributed on the surface of the slag ...

Embodiment 3

[0042] Lime, fluorite and fused magnesia are crushed to 0mm-10mm, uniformly mixed with alumina powder to prepare slag, and dried, wherein the slag includes: CaO: 27 %, CaF2: 42%, Al2O3: 28%, MgO: 1.4%, iO2: 1.1%, FeO: 0.18%, and the rest are impurities. Weigh 550kg of slag material and add it to a 1600kg three-phase slag melting furnace; turn on the power, start arcing at a voltage of 35kV, and after the current reaches a stable value (1.5kA), adjust the voltage and current to 48kV and 2kA respectively, and set the temperature at 20kg / min Add 800kg of slag at a high speed, and the smelting time is 85min; all the slag is melted, and the temperature of the molten slag is controlled to be 1570°C. The iron-aluminum alloy bar with an aluminum content of 15% by mass percentage is turned with a lathe to obtain iron-aluminum alloy chips with a size ≤ 50 mm, and 59.4 kg of iron-aluminum alloy chips are added to the molten slag to make it evenly distributed on the surface of the slag po...

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Abstract

The invention provides a preparing method of low-silicon pre-melted slag for electroslag remelting. The preparing method comprises the first step of even slag charge mixing, the second step of slag smelting and the third step of aluminum iron alloy adding and smelting. According to the preparing method of low-silicon pre-melted slag for electroslag remelting, the requirement for equipment is low, operation is easy, control is convenient, and cost is low. The problem that Al, Ti and elements prone to oxidation are burned down in the electroslag remelting process can be effectively solved.

Description

technical field [0001] The invention relates to the technical field of preparing pre-melted slag for electroslag remelting, in particular to a method for preparing low-silicon pre-melted slag for electroslag remelting. Background technique [0002] Pre-melted slag is an important guarantee for electroslag remelting to produce high-quality special steel and medium and high-end alloy materials. Compared with ordinary mixed slag materials for electroslag remelting, pre-melted slag has remarkable characteristics such as uniform composition, low moisture absorption rate, and low melting point. Time, to avoid phenomena such as slag collapse, thus ensuring the safety and efficiency of the electroslag remelting process. At the same time, the pre-melted slag can also effectively improve the quality of the bottom, surface and interior of the electroslag ingot, effectively reduce the hydrogen content in the electroslag ingot, significantly improve the stability of product quality and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B9/18
Inventor 李花兵姜周华张树才任翠东李星刘国海董艳伍冯浩朱红春王琦张彬彬
Owner NORTHEASTERN UNIV
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